Most Populous Islands of the UK (+ overseas territories, etc.)
What are the 20 most populous islands of the greater United Kingdom (including all remnants of the British Empire: the British Overseas Territories and Crown Dependencies).
The population statistics of the UK islands are obtained from 3 Wikipedia sources (some of them are outdated) [https://en.wikipedia.org/wiki/List_of_islands_of_the_British_Isles; https://en.wikipedia.org/wiki/British_Overseas_Territories; https://en.wikipedia.org/wiki/Crown_Dependencies].
For simplicity, both the British overseas territories and crown dependencies are each labelled as collectives/bailiwicks rather than individual islands. However, the mainland Great Britain islands have to be guessed individually (for example: Mersey Island, Skye, etc.).
Territories part of a continental landmass (Gibraltar; pop: 33,701) won't be included. Northern Ireland (pop: 1,927,900) is excluded because it is not a distinct island, but the northern quadrant of the island of Ireland (its inclusion is therefore awkward).